Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing

WANG Kai ran; JIA Ya nan; HU Da chao

doi:10.3969/j.issn.1001-4810.2013.01.009

Volume 32 Issue 1

Mar. 2013

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WANG Kai ran, JIA Ya nan, HU Da chao. Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing[J]. CARSOLOGICA SINICA, 2013, 32(1): 57-63. doi: 10.3969/j.issn.1001-4810.2013.01.009

Citation:

WANG Kai ran, JIA Ya nan, HU Da chao. Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing[J]. CARSOLOGICA SINICA, 2013, 32(1): 57-63. doi: 10.3969/j.issn.1001-4810.2013.01.009

Citation:

WANG Kai ran, JIA Ya nan, HU Da chao. Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing[J]. CARSOLOGICA SINICA, 2013, 32(1): 57-63. doi: 10.3969/j.issn.1001-4810.2013.01.009

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Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing

doi: 10.3969/j.issn.1001-4810.2013.01.009

1.
College of Geographical Sciences, Southwest University；Institute of Karst Geology, CAGS / Karst Dynamics Laboratory, MLR & GZAR
2.
College of Geographical Sciences, Southwest University
3.
Hunan Bureau of Non-ferrous Geological Exploring

Received Date: 2011-12-21
Publish Date: 2013-03-25

Abstract

Abstract

Groundwater in the Qingmuguan underground river is monitored with hydrochemistry and δ15N isotope techniques to investigate temporal and spatial variations of nitrate nitrogen and its possible sources from May, 2010 to October, 2010. The results show that nitrate concentrations are 5.077 mg/L at the Dingjialongdong outlet and 0.842 mg/L at the Tianchi inlet of the underground river. Nitrate concentrations of the groundwater are low at the Tianchi inlet, and the change range of the δ15N concentration is low, from -7.0475 ‰ to +7.059 ‰, which proves that the Tianchi inlet only polluted by nitrogen slightly and the outside influence to groundwater also slight, and the sewage and feces are not the major source ofδ15N in this point. The concentration ofδ15N at the Dingjialongdong outlet ranges, overall high and changes much more extensively, from -21.453 ‰ to +37.825 ‰. That proves the Dingjialongdong is affected more strongly by direct emission of feces from the pig farm and precipitation.
- underground river,
- 15N isotope,
- nitrate nitrogen,
- change characteristics

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References

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Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing

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Vriation features of nitrate pollution in karst underground river based on 15N isotope techinques: A case study in the Qingmuguan underground river, Chongqing

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